Who was in high school during the time of the Columbine shootings?

I am also very very interested in the event and the killers for quite some time now. I wasn't in highschool at the time, I was only 6 years old. But I briefly remember hearing of it at the time. All I remember hearing was a horrible thing happening in Colorado at the time. Through the years though, I heard a lot more about it, probably because all the controversy for it went on well into the 2000s. I remember in grade 3 my school had a lockdown - which turned out to be a false alarm, but at home that night I remember my mom telling me about the lockdown protocol because of the horrible shooting at a school in the states a few years ago (the lockdown at my school happened in 2003). Going off topic here, but Columbine changed everything in schools!